I'm all for faster animations. iOS 7, even with 7.1, still feels sluggish because of the animations. I can't interact with the OS until the animation has finished which is very frustrating and there are many apps which suffer from this. Flipboard, for example, if you pull down from the top to refresh on a section and there's no new articles, the 'no new items' animation fades in appears and I can't interact until it goes away.
So if iOS 8 has even faster animations, especially the app switcher, then I'm glad. Perhaps a video of the new speeds would be useful for those not using the beta to see it though.